I don't like equating things to money but I have no choice
  because yes, there's multiple currencies and I can't deny it
  that they're forms of money.

  My 10 yr old nephew with his pokemon cards. Currency.

  Men doing the things the women in their life ask them to in a
  timely fashion: Currency. ["How Much Do You Love Me?"]

  Me typing lots of words to get someone to say, "I understand" or
  "I disagree' or something entirely different: Currency.